* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  }
  
  html,
  body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #000;
  }
  
  #gameCanvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
  }
  
  /* Simple overlay UI */
  #ui {
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 10;
    background: rgba(0, 0, 0, 0.6);
    color: #f5f5f5;
    padding: 10px 12px;
    border-radius: 8px;
    max-width: 380px;
    font-size: 14px;
  }
  
  #ui h1 {
    font-size: 16px;
    margin-bottom: 6px;
  }
  
  #ui p {
    margin-bottom: 8px;
  }
  
  .file-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
  }
  
  #fileInput {
    font-size: 12px;
    max-width: 200px;
  }
  
  #score {
    font-size: 24px;
    font-weight: bold;
    color: #00ff00;
    margin: 10px 0;
  }
  
  #focusMode {
    color: #ffaa00;
    font-weight: bold;
  }
  
  /* Crosshair */
  #crosshair {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    pointer-events: none;
    z-index: 100;
    transition: transform 0.1s ease;
  }
  
  #crosshair.hit {
    transform: translate(-50%, -50%) scale(1.5);
  }
  
  #crosshair::before,
  #crosshair::after {
    content: '';
    position: absolute;
    background: rgba(255, 255, 255, 0.8);
    transition: background 0.1s ease;
  }
  
  #crosshair.hit::before,
  #crosshair.hit::after {
    background: rgba(0, 255, 0, 1);
  }
  
  #crosshair::before {
    left: 50%;
    top: 0;
    width: 2px;
    height: 100%;
    transform: translateX(-50%);
  }
  
  #crosshair::after {
    top: 50%;
    left: 0;
    height: 2px;
    width: 100%;
    transform: translateY(-50%);
  }
  
  /* Vignette overlay */
  #vignette {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
    background: radial-gradient(circle at center, transparent 0%, transparent 40%, rgba(0, 0, 0, 0.8) 100%);
    opacity: 0;
    transition: opacity 0.5s ease, background 0.5s ease;
  }
  
  #vignette.broad {
    opacity: 0.7;
    background: radial-gradient(circle at center, transparent 0%, transparent 20%, rgba(0, 0, 0, 0.4) 100%);
  }
  
  #vignette.focused {
    opacity: 1;
    background: radial-gradient(circle at center, transparent 0%, transparent 60%, rgba(0, 0, 0, 0.9) 100%);
  }